Re: Manipulating C code at the AST level, in C

On 18/08/2026 13:23, Geoff Clare wrote:
> The Natural Philosopher wrote:
> 
>> On 17/08/2026 13:44, Geoff Clare wrote:
>>>
>>> Quoting from the SUS at the previously-given URL:
>>>
>>>       To effect a poll, the application shall ensure that the timeout
>>>       argument for poll() is 0, or for ppoll() is not a null pointer and
>>>       points to a zero-valued timespec structure.
>>>
>> Poll means head you know. As in poll tax, Red poll cattle
>>
>> I am very uncertain in this contex that it means what you think it means
> 
> Well, the context is computing and https://foldoc.org/poll says:
> 
> poll
> To check the status of an input line, sensor, or memory location to
> see if a particular external event has been registered.
> 

Indeed. but mostly what you do is have an interrupt service routine do 
that whilst the computer gets on with 'other stuff', The ISR may be a 
timer like in a multitasking scheduler or it may be triggered by the 
hardware.
What no computer more advanced than a single thread microcontroller ever 
does is 'poll' the hardware with ISRs disabled




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